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Platinum (Pt) – Element 78 of the periodic table

Platinum (symbol Pt) is element number 78 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 195.08, and its phase under standard conditions is Solid. This element sits in period 6 and group 10 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 17, 1. The short electron configuration of Platinum is [Xe] 4f¹⁴ 5d⁹ 6s¹. Known uses of Platinum include Catalytic converters, Jewelry and Laboratory instruments.

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Properties of Platinum

Atomic number
78
Chemical symbol
Pt
Atomic mass
195.08
Category
Transition metal
Period
6
Group
10
Phase
Solid
Protons
78
Electrons
78
Neutrons (approx.)
117
Electron shells
2, 8, 18, 32, 17, 1
Outer-shell electrons
1
Discovered
Antonio de Ulloa (1735)

Electron configuration of Platinum

The electron configuration of Platinum (Pt), with 78 electrons, is shown below. The last shell (shell 6) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹
Short configuration
[Xe] 4f¹⁴ 5d⁹ 6s¹
Last shell
6s¹

What is electron configuration and how is it written?

Electron shells of Platinum

Distribution of 78 electrons of Platinum across shells K to P:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O17
  6. P1

What is a transition metal?

The transition metals are the d-block elements: usually good conductors of heat and electricity, with several oxidation states, and they form colourful compounds and important catalysts.

Uses of Platinum

Frequently asked questions about Platinum

What is the atomic number of Platinum?

The atomic number of Platinum (Pt) is 78; that is, every atom of it has 78 protons.

What is the electron configuration of Platinum?

The electron configuration of Platinum (Pt) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹; in short form it is [Xe] 4f¹⁴ 5d⁹ 6s¹, and its last shell is 6s¹.

What is the chemical symbol of Platinum?

The chemical symbol of Platinum is Pt.

Where is Platinum located in the periodic table?

Platinum is located in period 6 and group 10 and belongs to the “Transition metal” category.

What is the atomic mass of Platinum?

The atomic mass of Platinum is about 195.08 (atomic mass units).

What is the phase of Platinum under normal conditions?

The phase of Platinum under standard conditions is Solid.

What are the uses of Platinum?

Uses of Platinum include Catalytic converters, Jewelry and Laboratory instruments.

Who discovered Platinum?

Platinum was discovered by Antonio de Ulloa in 1735.

Elements in the same category as Platinum (Transition metal)

Rhodium (Rh)Palladium (Pd)Silver (Ag)Cadmium (Cd)Hafnium (Hf)Tantalum (Ta)Tungsten (W)Rhenium (Re)Osmium (Os)Iridium (Ir)Gold (Au)Mercury (Hg)Rutherfordium (Rf)Dubnium (Db)Seaborgium (Sg)Bohrium (Bh)Hassium (Hs)Meitnerium (Mt)Darmstadtium (Ds)Roentgenium (Rg)

See all Transition metals

Platinum’s group 10 neighbours

Nickel (Ni)Palladium (Pd)Darmstadtium (Ds)

Group 10 of the periodic table